Hi anne-ology, I think my subject line was misleading. My USB device is a musical keyboard rather than an external HD.
I inherited the keyboard from my step son. It happened to be a MIDI keyboard. This turned out to be just what I needed, as it tells me exactly the note number that has been pressed, (or released), plus any movement in the nine sliders. I have set up the sliders to correspond to the draw bars on a Hammond Organ. (The draw bars determine which harmonics are used to modify the sound produced. A very large number of variations are possible.) So armed with the MIDI information, I hope to write a program that can simulate a Hammond Organ. Possibly a pipe dream, but time will tell. But to get started I need to be able to read the MIDI stream, which at the moment is coming through a USB port. Hence my request for any info on code that might help help me to do that. Thanks for your reply, Noel -- Noel Lodge lodg...@gmail.com On 28 August 2017 at 08:25, anne-ology <lagin...@gmail.com> wrote: > If your external HD has LO, then there shouldn't be a problem. > > Question: is there some reason you're using .midi rather than > another sound application?; > .midi programs are outdated, since they supposedly don't have > the actual sound, rather merely text. > > Hoping this helps, and you're able to accomplish whatever you're > planning, > > > > > From: Marion & Noel Lodge <lodg...@gmail.com> > Date: Sun, Aug 27, 2017 at 8:47 AM > Subject: [libreoffice-users] Reading from a USB device. > To: "users@global.libreoffice.org" <users@global.libreoffice.org> > > > > I have a Studio Logic MIDI music keyboard which I have plugged into my PC > via a USB cable. Windows has automatically installed the appropriate > driver/s. I am attempting to read the MIDI input from the keyboard as I > want to see if I can use a Macro to modify the sound before it goes to the > speaker. (Actually I want to try to programmatically mix sine waves like > a Hammond Organ does - it may not be possible, but I'd like to give it a > try!) > > I installed a trial version of Device Monitoring Studio, see > https://www.hhdsoftware.com/device-monitoring-studio which enables me > to > trap the raw data from the keyboard, and I'm able to identify which keys > are pressed or released, and also the keyboard sliders' movements and > slider positions. For my purposes, that is all I need to extract from the > MIDI stream. > > I then went on the Web to see if I could find examples of Macro code that > would enable my program to emulate what I had been able to do with Device > Monitoring Studio. It turns out that USB coding is very complex and the > only examples I could find were in C, C++ or Visual Basic, none of which I > have, or have ever worked with. > > I then had a look at LibreOffice 5.3 SDK API. I believe that is the API > that Base uses, and over several years I have developed a number of > databases using macros that make calls to the API. One API service I found > was, com.sun.star.io.pipe, which looks as though it might be what I need, > but I don't know if it would work with a USB port, and I could not find any > macro code examples that might point me in the right direction. > > So my questions are - > 1. Does anyone know if it is possible to read from a USB port using a > LibreOffice macro utilising the API? If so can you point me to some > example code (preferably in Basic)? > 2. Failing that, is there a simple application on the market that can read > a USB MIDI stream into a buffer or file? I think Device Monitoring Studio > can do that, but it is expensive and has far more features than I'll ever > need. > > Any help in this regard would be much appreciated > > Thanks, > > Noel > -- > Noel Lodge > lodg...@gmail.com > > -- To unsubscribe e-mail to: users+unsubscr...@global.libreoffice.org Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted
